/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineAchievementsInterface.h
virtual [FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) AddOnAchievementUnlockedDelegate_Handle ( const [FOnAchievementUnlockedDelegate](API\Plugins\OnlineSubsystem\Interfaces\FOnAchievementUnlockedDelegate) & Delegate )